His stepdaughter from his second marriage is a beautiful older sister, Yuika, and a cute younger sister, Hikaru. "I want to squeeze their breasts and butts somehow...!" The stepfather's head is filled with lewd desires. One day, he learns of the existence of the "Brainwashing Maker." It is an app that can rewrite the mind of a target and brainwash them. Though skeptical, he uses it, and the sisters fight over their stepfather's dick! Fuck each other! Creampie them over and over again! The sisters are completely brainwashed...